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is a significant concern for physicians. Central
% p" }/ E6 i3 y6 Gprecocious puberty (CPP), which is mediated& y5 W3 L: Y/ O& s2 K
through the hypothalamic pituitary gonadal axis, has
/ }1 ^$ R4 a# d/ Wa higher incidence of organic central nervous system. t2 `4 R. J& e" X# Y3 U5 N
lesions in boys.1,2 Virilization in boys, as manifested
7 r, k, d: ^! r" {8 H0 b, Z4 Jby enlargement of the penis, development of pubic* _0 B$ y: Y4 G- g4 d& p
hair, and facial acne without enlargement of testi-
; y; Q" H( v, E7 Ecles, suggests peripheral or pseudopuberty.1-3 We
; h6 l: Q" p# D# A' Rreport a 16-month-old boy who presented with the7 B1 t7 n6 d1 \: G! \% E
enlargement of the phallus and pubic hair develop-, f- n. b- D6 }$ C. [7 P
ment without testicular enlargement, which was due# \7 P/ p6 O$ u8 Q: I
to the unintentional exposure to androgen gel used by$ z2 D7 ]4 U# y/ m
the father. The family initially concealed this infor-
6 o- ?3 H* @9 d: V B; Smation, resulting in an extensive work-up for this
( x! ?: Q" P, e' c9 r$ Bchild. Given the widespread and easy availability of
; q- | C' o! @0 ~* etestosterone gel and cream, we believe this is proba-& X+ N( B6 z4 z' o. n9 e
bly more common than the rare case report in the' ]% g9 a0 k- G9 U! \; R9 O0 A
literature.46 w! `' L* V+ P
Patient Report
4 f, G# P" q7 P A2 r% g) ]A 16-month-old white child was referred to the* Q2 l" ?' D+ b- n l0 }
endocrine clinic by his pediatrician with the concern
4 ^- F5 O% P$ s& S4 nof early sexual development. His mother noticed
/ t% u( X0 \) T$ s' Mlight colored pubic hair development when he was
3 w' h4 ^. {, [: ?) H* J& A+ qFrom the 1Division of Pediatric Endocrinology, 2University of( \) V- h' K* K, l
South Alabama Medical Center, Mobile, Alabama.
4 \$ c: V, P* F2 f& s& {9 l1 U' oAddress correspondence to: Samar K. Bhowmick, MD, FACE,1 o6 T% {- Z$ k) S ^) V
Professor of Pediatrics, University of South Alabama, College of4 z& S3 g% G' X1 M8 F7 o/ h' o2 G
Medicine, 2451 Fillingim St. Mastin 212, Mobile, AL 36617-2297;
. z6 |6 k; t1 c6 `2 Ye-mail: [email protected]., v8 V( x* R: N( r3 c3 l( r
about 6 to 7 months old, which progressively became
5 ~; I2 }: ?" R! J- x9 Cdarker. She was also concerned about the enlarge-
: {9 @& j$ Z3 a: n' Zment of his penis and frequent erections. The child
$ _3 \# z! V- d( Zwas the product of a full-term normal delivery, with7 F/ r/ _; `7 `7 e. ~
a birth weight of 7 lb 14 oz, and birth length of; U3 q% R" ~8 A. }5 d
20 inches. He was breast-fed throughout the first year, T D |' P% f0 q5 [
of life and was still receiving breast milk along with
! b" O. h! {) b& Q5 msolid food. He had no hospitalizations or surgery,6 `" M) k, v ?
and his psychosocial and psychomotor development' u) b$ ?/ V1 ?" c8 c! E5 @: ^
was age appropriate.
5 G% K6 J% D, C" c/ }' pThe family history was remarkable for the father,4 Y! [& S9 B: m0 q3 c) v( N
who was diagnosed with hypothyroidism at age 16, R5 L' Y% L& X5 Z- i
which was treated with thyroxine. The father’s
5 {8 Y4 _3 V6 S! T) J" @height was 6 feet, and he went through a somewhat
5 R/ q7 b0 d! `5 uearly puberty and had stopped growing by age 14.
S" ?" T1 V* jThe father denied taking any other medication. The
4 N2 P, u0 C& [6 U5 c _; ychild’s mother was in good health. Her menarche
. s8 l& C6 @, A* j! \- Lwas at 11 years of age, and her height was at 5 feet
2 q4 z I. d( O' c! I$ ~5 inches. There was no other family history of pre-6 R" G! R d$ O! g0 Y* f, K3 o+ R
cocious sexual development in the first-degree rela-
( I2 e7 }( T+ x2 q% ctives. There were no siblings.
" J, N: u/ ^3 [Physical Examination
! L: Q8 ^2 K/ p% `( m, i4 |: VThe physical examination revealed a very active,: o0 j, ~% C. p
playful, and healthy boy. The vital signs documented, _7 E9 f+ T9 k& `
a blood pressure of 85/50 mm Hg, his length was
* v# n0 P7 B K! w& \7 y2 l; ~% t90 cm (>97th percentile), and his weight was 14.4 kg: S- N2 r5 h# z2 O% \2 M
(also >97th percentile). The observed yearly growth3 j' Z9 `8 [# a: S+ p: Y" Z
velocity was 30 cm (12 inches). The examination of5 a' g$ N* M( }4 z
the neck revealed no thyroid enlargement.
) Y3 z. l2 u) c; D" p- @" LThe genitourinary examination was remarkable for5 g; E# l( O# K3 s7 ~( Y. f9 ]! i( a
enlargement of the penis, with a stretched length of
" a+ W1 q4 h3 l7 ]. R5 k) F' q8 cm and a width of 2 cm. The glans penis was very well
3 u8 a d7 s/ [$ N; S0 Mdeveloped. The pubic hair was Tanner II, mostly around- E1 @3 P; G( V
540
4 A4 q4 ~. K0 r7 G0 Q, rat University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from
9 Y6 i) s. P4 C5 e' y3 Othe base of the phallus and was dark and curled. The
9 O+ z0 S1 p! u. ctesticular volume was prepubertal at 2 mL each.
! j9 _# m6 O; D0 QThe skin was moist and smooth and somewhat
" ^* S0 |' Z" T/ hoily. No axillary hair was noted. There were no
4 p7 J9 J4 K% l1 ^0 J0 z) C% \abnormal skin pigmentations or café-au-lait spots.5 y, E; b; y- V) ^
Neurologic evaluation showed deep tendon reflex 2+- q# c2 B+ T$ y" ~6 B& a7 X' K
bilateral and symmetrical. There was no suggestion! g& ~4 u$ _+ r
of papilledema.
% q0 ]) o4 s" e' @% r; ~0 P$ K' WLaboratory Evaluation( x" i) l# A6 h; k; r
The bone age was consistent with 28 months by
$ D2 k4 O t' M5 Ausing the standard of Greulich and Pyle at a chrono-
5 R8 [0 d' E' q: n7 Y3 U2 p2 Tlogic age of 16 months (advanced).5 Chromosomal7 b4 P% E+ o2 v
karyotype was 46XY. The thyroid function test' D( A$ ?- p) B. |
showed a free T4 of 1.69 ng/dL, and thyroid stimu-$ t6 l& d' A/ J7 l) |7 ^& N& d
lating hormone level was 1.3 µIU/mL (both normal).
# N' U+ o, \# i; G# ?5 ]7 y6 G+ n- TThe concentrations of serum electrolytes, blood4 J4 i* q. X Z' q% P. {
urea nitrogen, creatinine, and calcium all were
7 ?/ b4 n. [4 i1 C. ^9 e) Cwithin normal range for his age. The concentration
4 z f+ y$ J5 Cof serum 17-hydroxyprogesterone was 16 ng/dL
' K1 r4 ~ S/ G- S |8 C(normal, 3 to 90 ng/dL), androstenedione was 20& a( M5 ~/ [ {/ D7 D
ng/dL (normal, 18 to 80 ng/dL), dehydroepiandros-
) s. L1 F! S7 K% F+ ]2 E3 Gterone was 38 ng/dL (normal, 50 to 760 ng/dL),
8 p/ E3 M6 Y' ~0 {desoxycorticosterone was 4.3 ng/dL (normal, 7 to6 q# O/ T+ \1 H
49ng/dL), 11-desoxycortisol (specific compound S)
$ X5 m) n2 J+ l$ F$ |was 43 ng/dL (normal, 10 to 156 ng/dL), serum cor-& {9 c: T/ J& c5 C
tisol was 7.6 µg/dL (normal, 2.8 to 23 µg/dL), total
2 k) F8 {! N( N3 w+ Ktestosterone was 60 ng/dL (normal <3 to 10 ng/dL),
: z) a+ E6 I) R( Qand β-human chorionic gonadotropin was less than
- B5 |: w- |$ q- v, @# K+ q% Y5 mIU/mL (normal <5 mIU/mL). Serum follicular* |4 c# G7 @9 b6 g
stimulating hormone and leuteinizing hormone
" M# m" Z+ \, X; z. _' Nconcentrations were less than 0.05 mIU/mL, l0 m) h" ]: u7 {
(prepubertal).% P& \$ ]/ q% b
The parents were notified about the laboratory
- ^1 y! z6 E* j' l9 L) Aresults and were informed that all of the tests were1 j6 {5 t( H* T5 V$ ~
normal except the testosterone level was high. The$ C, M0 G5 F! I* m
follow-up visit was arranged within a few weeks to9 W( r/ B% ?3 m' f% R0 r
obtain testicular and abdominal sonograms; how-
. u I' q8 P! u, G! j5 L0 |ever, the family did not return for 4 months.+ m4 f# u' |3 _6 ~! ^+ S
Physical examination at this time revealed that the" G( v" N! y+ d5 z
child had grown 2.5 cm in 4 months and had gained- ?+ D( S3 k. s
2 kg of weight. Physical examination remained
8 ~& p5 i! s8 _, @0 n+ a6 Y7 Vunchanged. Surprisingly, the pubic hair almost com-# e) x1 Z; j& ^9 S
pletely disappeared except for a few vellous hairs at
" w* I, x# k; K$ dthe base of the phallus. Testicular volume was still 2
9 X2 o9 \! ~" o3 t& m2 cmL, and the size of the penis remained unchanged." a, Y$ z& D, j6 d8 l
The mother also said that the boy was no longer hav-
$ B& i( Z2 g0 l _8 y. ning frequent erections.! M) i0 J/ T5 d. ^( _
Both parents were again questioned about use of
" \7 `4 u+ D) a/ \8 P# Hany ointment/creams that they may have applied to, i; Z- E0 _' O6 B
the child’s skin. This time the father admitted the: z5 y4 ? p/ U5 y6 W
Topical Testosterone Exposure / Bhowmick et al 541
# F1 w* X! r$ Puse of testosterone gel twice daily that he was apply-: u Q, m+ P' n6 [
ing over his own shoulders, chest, and back area for
* N' t1 a& V$ _. `- O! t5 Wa year. The father also revealed he was embarrassed
. @" h6 Y; v' Y1 B$ @to disclose that he was using a testosterone gel pre-0 X# X- N; t/ |3 F) m b
scribed by his family physician for decreased libido
: S; @% H8 h/ L, K$ Nsecondary to depression.4 ^: ?# E# Y# U. {
The child slept in the same bed with parents.
: Z" Z, F+ _$ q! }& n& F; M% I/ [The father would hug the baby and hold him on his
3 N7 g! t' b7 V9 F! e: Wchest for a considerable period of time, causing sig-# M/ L7 T# m1 a) l
nificant bare skin contact between baby and father.7 b0 L- P/ J: n
The father also admitted that after the phone call,$ q* E! l5 u) }7 N8 j
when he learned the testosterone level in the baby
2 ]0 b% F, k9 r) v' i) X: mwas high, he then read the product information
2 ]7 o, {( I0 x3 ypacket and concluded that it was most likely the rea-! ]% E+ I7 N! n) I
son for the child’s virilization. At that time, they
w* G) [; [# N1 X- n! \decided to put the baby in a separate bed, and the
* u8 Y" W& w6 [# n( a b$ f9 F% Yfather was not hugging him with bare skin and had
2 [* V0 i% T* @been using protective clothing. A repeat testosterone
+ o7 |% h9 e) |6 Q9 e ?4 P- c# Btest was ordered, but the family did not go to the
$ ~9 D) \0 G: K8 {& }; p( M% elaboratory to obtain the test.8 a7 t& ?! U/ ]) m4 N, v; x8 i
Discussion
! |. O: |# i8 f* Z+ `Precocious puberty in boys is defined as secondary
7 S6 Y5 S$ v# H) D% jsexual development before 9 years of age.1,4
* W+ y) l" }* p% G7 X8 w3 L" J- p7 YPrecocious puberty is termed as central (true) when6 I8 u) O3 L7 |1 F
it is caused by the premature activation of hypo-" T" a0 g2 _) i z
thalamic pituitary gonadal axis. CPP is more com-
0 N$ {- b5 R5 P3 A) t; [+ a3 Rmon in girls than in boys.1,3 Most boys with CPP- s2 c. y/ S; v* ?% Q! K8 N
may have a central nervous system lesion that is
% P, A* v S+ w# _; Fresponsible for the early activation of the hypothal-6 a$ _, m4 v) z) Q i0 l d$ t
amic pituitary gonadal axis.1-3 Thus, greater empha-
* ]- ?3 V# S. V8 ]9 [ Y4 ^sis has been given to neuroradiologic imaging in: K y2 i2 x, }! _# H
boys with precocious puberty. In addition to viril-, r( a& w2 Q7 z4 h u+ S6 J
ization, the clinical hallmark of CPP is the symmet-; _6 Z- k* ?* v2 a- U9 v4 m. b1 O
rical testicular growth secondary to stimulation by
o( d6 M" _: a. b( E* |gonadotropins.1,3% \' H; H- y: M! L8 L$ e
Gonadotropin-independent peripheral preco-& p* \/ X8 ?' F* u! G! \5 T1 E
cious puberty in boys also results from inappropriate1 \- G. ~7 w7 U: k0 G) ^2 o5 m
androgenic stimulation from either endogenous or4 \& S5 D3 F2 ~/ V3 i+ A
exogenous sources, nonpituitary gonadotropin stim-0 @7 M1 ]/ Y# n
ulation, and rare activating mutations.3 Virilizing! O/ `. A" @' E1 ?6 O
congenital adrenal hyperplasia producing excessive
2 C0 ~: A A/ x1 ^adrenal androgens is a common cause of precocious2 [$ H% A4 Z" n- |* L5 _: R: L ^
puberty in boys.3,4
: m3 @- p* g, Q* o, ZThe most common form of congenital adrenal
0 p2 ] W) Y/ G ~hyperplasia is the 21-hydroxylase enzyme deficiency.
. V8 \4 `+ e, MThe 11-β hydroxylase deficiency may also result in
1 b! @3 d( {0 @% s1 ]excessive adrenal androgen production, and rarely,
! F% d" E( J( h9 L) C6 u; @0 |) fan adrenal tumor may also cause adrenal androgen; ~: j2 P1 _( @0 c
excess.1,3, O' i6 S. s" `, v8 c
at University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from
- B" m8 K' ]0 e1 v8 t6 R' i/ r542 Clinical Pediatrics / Vol. 46, No. 6, July 2007
$ P: |" r5 z3 K* E& z# E BA unique entity of male-limited gonadotropin-) }2 y6 O/ F" v6 G* c2 }, R) t. U4 ]
independent precocious puberty, which is also known
7 C7 w! R7 f, W: [6 q6 w9 g2 Oas testotoxicosis, may cause precocious puberty at a$ O& a5 j+ O' b2 x6 X0 E
very young age. The physical findings in these boys8 q4 R/ U; e, W
with this disorder are full pubertal development,: `; m- v) l/ Q2 }
including bilateral testicular growth, similar to boys7 g+ j" {. d# j1 z: ~* p1 J
with CPP. The gonadotropin levels in this disorder
$ E/ g$ r0 f( L0 t+ ?( m* K% x: r" Lare suppressed to prepubertal levels and do not show- R# _$ U: O l
pubertal response of gonadotropin after gonadotropin-
" b) y0 @( ]/ r8 Yreleasing hormone stimulation. This is a sex-linked
% ~4 e" `( m5 I! q: n' Vautosomal dominant disorder that affects only, J4 K) H. S" `: {! p* t# U7 o
males; therefore, other male members of the family
# Y8 b) z/ k# U3 Z8 dmay have similar precocious puberty.3
0 d" S% n; G3 eIn our patient, physical examination was incon-' `' `4 D: L! ], Z
sistent with true precocious puberty since his testi-
3 r8 X7 d8 _9 U) f7 Ycles were prepubertal in size. However, testotoxicosis6 ]+ N/ h9 F, g1 H3 }4 h
was in the differential diagnosis because his father2 {" a7 c2 j: m6 R! A0 E- W
started puberty somewhat early, and occasionally," }; ]1 n6 a3 `0 |6 L1 A- O/ v7 B
testicular enlargement is not that evident in the
9 t+ J- F3 E4 S; ubeginning of this process.1 In the absence of a neg-6 g$ h0 e* i$ |& q9 l& n
ative initial history of androgen exposure, our: C3 a. R( O4 V% V1 j
biggest concern was virilizing adrenal hyperplasia,% ?8 n; e' F/ H* N; {- H
either 21-hydroxylase deficiency or 11-β hydroxylase
9 g2 @4 U ^$ Y! `1 p' F" ]deficiency. Those diagnoses were excluded by find- p2 G. o* D: Y% f8 W
ing the normal level of adrenal steroids.$ t& O+ M; R/ E4 ^; C* E' V
The diagnosis of exogenous androgens was strongly
2 }+ ]6 I/ J4 B. M, @; asuspected in a follow-up visit after 4 months because
8 R" d2 f7 v# N) xthe physical examination revealed the complete disap-
$ }5 Q2 e! E# C# p! ~5 Lpearance of pubic hair, normal growth velocity, and7 b* x) Y* k# S! ]6 n# w
decreased erections. The father admitted using a testos-
( a8 _3 ^9 g3 V. s; Fterone gel, which he concealed at first visit. He was
# _: ^: q% H# r- `/ Tusing it rather frequently, twice a day. The Physicians’
0 k4 T& C! R0 {% K: ~Desk Reference, or package insert of this product, gel or
' M% J/ N o6 Z' ]' f0 o$ mcream, cautions about dermal testosterone transfer to' o& o5 T/ I7 K/ l
unprotected females through direct skin exposure.( Y& W, @+ C" ^" B/ `
Serum testosterone level was found to be 2 times the
" s$ Q% m5 m0 H7 Q0 mbaseline value in those females who were exposed to" k! a7 E7 u2 u# ?7 J: R
even 15 minutes of direct skin contact with their male
- r8 r6 I6 t. \- J/ ~partners.6 However, when a shirt covered the applica-
5 V; T" u, x8 u! q ?* w6 ^: r9 Ytion site, this testosterone transfer was prevented.
g, ]/ `( G. s. NOur patient’s testosterone level was 60 ng/mL,
2 j: u! j( v. {which was clearly high. Some studies suggest that
' Y* M7 R% Q+ A/ zdermal conversion of testosterone to dihydrotestos-* J" Q) _& u3 J% y& n/ d- e) D
terone, which is a more potent metabolite, is more+ @* E& q' N a; I6 @, t
active in young children exposed to testosterone
6 J6 T2 S8 M7 `exogenously7; however, we did not measure a dihy-7 E- [6 O2 J! l( k6 e
drotestosterone level in our patient. In addition to; i# r3 x& L' h5 q
virilization, exposure to exogenous testosterone in X' U( d" b. A# }
children results in an increase in growth velocity and1 ~! n' Q1 r( m2 }$ B4 b
advanced bone age, as seen in our patient.
: e' O8 [- w" Z/ u; F1 qThe long-term effect of androgen exposure during
% e* q+ _6 V/ x7 gearly childhood on pubertal development and final
" S5 X' u% y1 R& C* W1 oadult height are not fully known and always remain
" Z/ W' d. Y0 P! j9 l i0 D& za concern. Children treated with short-term testos-1 r. I/ N& m* @6 o' K0 {* G- c
terone injection or topical androgen may exhibit some/ }) K( E+ `. P
acceleration of the skeletal maturation; however, after
7 ]# s! U9 W6 }* Q8 X( Lcessation of treatment, the rate of bone maturation
2 u$ \0 _( i* \# w B" _5 g4 wdecelerates and gradually returns to normal.8,9
& H. A/ K8 _0 E: P) x5 sThere are conflicting reports and controversy" ?) S1 e$ }# ] b ]* P
over the effect of early androgen exposure on adult/ E) z) \5 g# x2 g) F- |6 L" ]
penile length.10,11 Some reports suggest subnormal) x% v6 a/ R! J
adult penile length, apparently because of downreg-
* C! Z" L. h9 F6 F1 oulation of androgen receptor number.10,12 However,4 ?5 k! z$ x! U/ p
Sutherland et al13 did not find a correlation between. R7 e, X/ P+ Y( ^3 D6 F
childhood testosterone exposure and reduced adult
. B' I/ x* q, zpenile length in clinical studies./ s5 c& K6 u% c1 q. _) `
Nonetheless, we do not believe our patient is
0 c0 k9 o7 H9 F L7 Ogoing to experience any of the untoward effects from( ?: [2 p% w) s+ `$ j* ^
testosterone exposure as mentioned earlier because, E9 B( O, S' m; K: E
the exposure was not for a prolonged period of time.. E; A% e7 W. a1 t! ~
Although the bone age was advanced at the time of
- y# m) y3 Y5 c5 g6 U3 M3 M2 H! ydiagnosis, the child had a normal growth velocity at
f4 t( q# U: |/ L! g+ x; jthe follow-up visit. It is hoped that his final adult
! @! J: P" E- S6 W' Bheight will not be affected.) V6 E* ?3 p% e t8 X
Although rarely reported, the widespread avail-
, f# h# K7 q) [6 @3 lability of androgen products in our society may7 l/ T1 h, y' d$ Q' B+ c
indeed cause more virilization in male or female
$ f# h6 U# \, S/ m! Z uchildren than one would realize. Exposure to andro-, F0 g" `' I: E, s; Y. ?
gen products must be considered and specific ques-
0 t1 F6 H. a! D+ O: d+ xtioning about the use of a testosterone product or2 ]2 r, I4 z/ i# c$ I/ o
gel should be asked of the family members during
8 ^+ S4 i) F6 H7 gthe evaluation of any children who present with vir-
8 X6 t, P t- s% [8 @0 \ilization or peripheral precocious puberty. The diag-! L8 { e0 a5 t% M
nosis can be established by just a few tests and by$ [. R% F P( @$ e! _8 A* u
appropriate history. The inability to obtain such a
+ T5 R* _/ y+ L5 @& ghistory, or failure to ask the specific questions, may
* m( i* R# D5 N/ O, U$ T; H* ?result in extensive, unnecessary, and expensive
- U" o! _* ^6 F% I0 xinvestigation. The primary care physician should be
) x7 t: q f. G ]( Caware of this fact, because most of these children
1 _' o9 P" B p7 L8 @may initially present in their practice. The Physicians’' t: r2 k; h7 E8 B5 W0 _* O
Desk Reference and package insert should also put a$ a' a; W G7 I3 W) P5 L! I
warning about the virilizing effect on a male or
1 O, H& X. d7 E* Cfemale child who might come in contact with some-
- H% y( [7 o- O# xone using any of these products." w, P! m( W& @1 [' j
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